Stone-saw.



UNITED s ms PATENT OFFICE.

CHARLES L. MIEL, OF SACRAMENTO, CALIFORNIA, ASSIGNOR TO THE UNITEDSTATES STONE SAW COMPANY, OF TUCSON, ARIZONA TER- RITORY, A CORPORATIONOF ARIZONA TERRITORY.

STONE-SAW.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed April 1'7, 1905. Serial No. 255,906.

To all whom it may concern:

Be it known that I, CHARLns L. MIEL, a citizen of the United States,residing at Sacramento, Sacramento county, California, have inventedcertain new and useful Improvements in Stone-Saws, of which thefollowing is a full, clear, and exact description.

My invention relates to improvements in stone-sawing machines, theobject of the same being to provide means to prevent injuring the edgesof the stone at the ends of the saw cuts or grooves as the same arebeing formed.

With the present saws constructed in various ways, and particularlythose which include a reciprocating saw-beam provided with a series ofsaw-blades, it is customary to entirely withdraw one or more of theblades from the slot at the end of each stroke. By this practice it hasbeen found that the edges of the stone adjacent to the ends of the slotare injured by the blades when they enter the same, for unless theyenter accurately, and that is practically impossible, (if the blades areof any substantial length) the said corners will be broken away orchafed off, injuring the work and resulting in substantial loss both ofmaterial and labor. It is my aim to eliminate this danger and at thesame time to provide such a construction that the stroke orreciprocatory movement of the saw-beam may be substantial.

In the accompanying drawings, Figure 1 is aside elevation conventionallyillustrating my invention in use. Fig. 2 is a sectional view of parallelgroups of saw-blades as theyappear in operation.

A is a frame suspended in any suitable mannerfor example, by chains BBwhereby the same may be raised or lowered at will.

C is a saw-beam. D D are saw-blades carried thereby and capable ofvertical adjustment. In the drawings I have shown the beam broken awayin the center, since in ordinary practice more than the four bladesshown would be employed. It is immaterial how the adjustment of theblades is effected.

E is a pitman or other suitable device connected to the frame, so thatthe saw-beam may be reciprooated to and fro.

F represents the stone being operated upon.

The invention consists in providing a series of independentadjustablesaw-blades spaced apart from each other, the two end blades DD being of greater width than the intermediate blades D D, the formerbeing of such width relatively to the stroke of the saw-beam that whilethe said end blades D D may be entered well into the slot being formedin the stone they will not be entirely retracted therefrom. For example,as shown in Fig. 1 in solid lines, the blade D at the left-hand end ofthe saw-beam has entered entirely into the slot and beyond the edgethereof, while the blade at the right-hand end of the saw-beam has beennearly but not quite withdrawn from said slot. In the same figure indotted lines the blades are shown at the limit of their excursion in theopposite direction, the right-hand end blade D being well into the slot,while the left-hand end blade D is nearly but not quite withdrawntherefrom. The result is that by having these end blades ofsubstantially greater width than the intermediate blades, acomparatively long stroke may be given to the saw-beam withoutwithdrawing any of the blades entirely from the slot. Since all theblades will be entirely or partially entered at all times, the edges ofthe stone will not be injured-a feature of the greatest importance wherethe end faces of the stone are already shaped and finished and whereinjury thereto would undo all said work, injuring the material andperhaps rendering the block useless, as would be the case in the eventit were found necessary to refinish the ends, which would result in thedestruction of the proper dimensions. While this improvement is simple,it nevertheless effects a substantial saving at little or no expense.

It is necessary to the invention that the blades D D be spaced apart, sothat an abrading material, such as shot, may be introduced into the slotbetween the blades at all times. By my improvement substantial economiesare attained in the use of abrading materials. This results because noblade entirelyclears the slot. If the contrary were true, it wouldpermit the abrading material between the withdrawn blades to be forcedout.

In Fig. 2 I have illustrated four gangs of saw-blades arranged inparallel. The sawbeams (not seen) would be merely duplicated in thiscase. The solid lines in this instance and the dotted lines respectivelyindicate the corresponding positions of the saw-blades in Fig. 1.

the stone it would be immaterial if the edges adjacent to the end of theslorwere' chipped or battered by the entrance of the blades which hadbeen'e'ntirel'y removed or retracted from the slot.

What I claifn is' 1. In a stone-sawingmachinefa recipmeating saw-beam,means for supporting and reciprocating the same, a "series of bladesadjustablysupporte'd'by said beam, said blades greater width than theintermediate blades.

means-ior suppsrtrng and reciprocating the same, "a 'plu'rality ofbladesadjiista'bly carried thereby, arranged in line and spaced apart,

fthe'end blades being of greater width than the intermediate blades.

In a stone-sawing machineyasaw-beam, a series of blades or cutters,adjustably car- "ri'edther'byfsai'd cutters being spaced apart andarranged in line, one of theend blades being of greaterwidth than"theintermediate blades.

CHARLES 'L. Witnesses;

Rs-c. Mata-m,

L. Vanni-am.

